A film crew took over a pub in Bushey for a mystery shoot as two famous actors were spotted on set.

The Swan in Park Road was covered in large black sheets to stop anyone from looking inside, while the film crew was camped outside when filming took place.

Although producers were tight-lipped over what was being filmed, it is understood a pilot was being shot.

Watford Observer: Screenshot of Sarah Parish (turquoise top) and Hugh Bonneville (suit jacket) outside The Swan in Bushey where filming was taking place.Screenshot of Sarah Parish (turquoise top) and Hugh Bonneville (suit jacket) outside The Swan in Bushey where filming was taking place. (Image: Newsquest)

At one point two people appeared outside and looked very much like Sarah Parish, known for starring in Cutting It and Mistresses and Hugh Bonneville, famous for being in Downtown Abbey and Paddington.

The home-grown British talent were briefly seen talking to each other and a third person on the footpath.

Watch Sarah Parish and Hugh Bonneville talking outside The Swan, Bushey. 

Someone also commented on social media about who they saw. They said: “We walked past and saw Hugh Bonneville come out in an old-fashioned suit and bow tie.”

Both stars posted the same picture on their Instagram accounts five days ago, leading to speculation that they are currently working together.  

Watford Observer: Filming started at 12pm and finished at 6pm.Filming started at 12pm and finished at 6pm. (Image: Newsquest)

Filming took place from 12pm to 6pm at the pub. 

Watford Observer: The pub's front was covered while filming took place.The pub's front was covered while filming took place. (Image: Newsquest)

It is believed filming also took place at St James’ Restaurant in the village and another person said they saw filming at the church.

Sarah and Hugh previously worked together on the sitcom W1A that satires the running of the BBC.

It is named as the postal code of the BBC’s headquarters, Broadcasting House, which is W1A 1AA.  

Sarah took to Instagram on July 11 to share a picture of her on set with Hugh and Rufus Jones, who is an actor and director.

She said: “Cooking something up with this couple of geniuses.”

Speculation has been rife on various social media channels as to what the two could be filming.

Some people said they are hoping for a return of W1A, while another person suggested it could be an episode of Midsomer Murders being filmed.